Recently, our app collected many of these crashes through the fabric (most of them crashed on 11.2 https://drive.google.com/open?id=1v7YfxrHZL45Qfvug_asHvXWe5HrFCvpB), who knows what caused it https://drive.google.com/open?id=1ZXVnayfpvsbpmLekkgO0hmuM1mZCjaBG.
iOS 11.2 More Crashed: MRAVConcreteRoutingDiscoverySession
I'm seeing similar crashes on iOS 11.2 as well. Did you end up finding a cause?
seeing the same crash as well reported by Crashlytics/Fabric
# OS Version: 11.2.2 (15C202)
# Device: iPhone 6
# RAM Free: 5.2%
# Disk Free: 51.7%
#15. Crashed: MRAVConcreteRoutingDiscoverySession
0 libobjc.A.dylib 0x1807b57f4 objc_object::release() + 16
1 libobjc.A.dylib 0x1807b6138 (anonymous namespace)::AutoreleasePoolPage::pop(void*) + 836
2 libdispatch.dylib 0x180efcf14 _dispatch_last_resort_autorelease_pool_pop + 36
3 libdispatch.dylib 0x180ed9328 _dispatch_queue_invoke$VARIANT$mp + 384
4 libdispatch.dylib 0x180ed9d20 _dispatch_root_queue_drain_deferred_wlh$VARIANT$mp + 404
5 libdispatch.dylib 0x180ee203c _dispatch_workloop_worker_thread$VARIANT$mp + 644
6 libsystem_pthread.dylib 0x181176f1c _pthread_wqthread + 932
7 libsystem_pthread.dylib 0x181176b6c start_wqthread + 4